[1] Hosp Clin Valencia, Rheumatol, Valencia, Spain
[2] Hosp Don Benito Villanueva, Rheumatol, Badajoz, Spain
[3] Hosp Univ Canarias, Rheumatol, Canarias, Spain
[4] Complejo Asistencial Palencia, Rheumatol, Palencia, Spain
[5] Hosp Univ Ramon & Cajal, Rheumatol, Madrid, Spain
[6] Hosp Univ Clin San Carlos, Rheumatol, Madrid, Spain
[7] Hosp Univ Infanta Elena, Rheumatol, Madrid, Spain
[8] Hosp Univ la Princesa, Rheumatol, Madrid, Spain
[9] Hosp Univ Araba, Rheumatol, Alava, Spain
[10] Hosp Univ Guadalajara, Rheumatol, Guadalajara, Spain
[11] Hosp Vega Baja, Rheumatol, Orihuela, Spain
[12] Hosp Univ Doctor Negrin, Rheumatol, Gran Canaria, Spain
[13] Hosp Univ Tajo, Rheumatol, Aranjuez, Spain